Spark plasma sintering technique for reaction sintering of Al2O3/Ni nanocomposite and its mechanical properties

被引：48

作者：

Isobe, Toshihiro ^{[2
]}

Daimon, Keiji ^{[2
]}

Sato, Toshihiko ^{[2
]}

Matsubara, Takashi ^{[2
]}

Hikichi, Yasuo ^{[2
]}

Ota, Toshitaka ^{[1
]}

机构：

[1] Nagoya Inst Technol, Ceram Res Lab, Gifu 5070071, Japan

[2] Nagoya Inst Technol, Dept Mat Sci & Engn, Nagoya, Aichi 4668555, Japan

来源：

CERAMICS INTERNATIONAL | 2008年 / 34卷 / 01期

关键词：

hot pressing; nanocomposites; mechanical properties; toughness and toughening; Al2O3; spinels; structural applications;

D O I：

10.1016/j.ceramint.2006.08.017

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Al2O3/Ni nanocomposites were prepared by spark plasma sintering (SPS) using reaction sintering method and the mechanical properties of the obtained nanocomposites are reported. The starting materials of Al2O3-NiO solid solution were synthesized from aluminum sulfate and nickel sulfate. These Al2O3-NiO powders were changed into Al2O3 and Ni phases during sintering process. The obtained nanocomposites showed high relative densities (>98%). SEM micrographs showed homogeneously dispersed Ni grains in the matrix. The 3-point strength and the fracture toughness of the composites significantly improved from 450 MPa in the monolithic alpha-Al2O3 to 766 MPa in the 10 mol% (2.8 vol.%) Ni nanocomposite and from 3.7 to 5.6 MPa m(1/2) in 13 mol% (3.7 vol.%) Ni nanocomposite. On the other hand, Young's modulus and Vickers hardness of the nanocomposites were mostly same as those of the monolithic alpha-Al2O3. (C) 2006 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：213 / 217

页数：5

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